Use an identity to write the expression as a single trigonometric function or as a single number.± 
A. cos 15?
B. sin 15?
C. cos 60?
D. sin 60?
Answer: B
Mathematics
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Find the following. Assume that letters can represent any real number.
A. 
B. 
C. 2a + b
D. 
Mathematics
Evaluate the integral.
A. 
sin 4t - 
sin 2t + C
B. 
sin 2t + 
sin 6t + C
C. 
sin 2t - 
cos 6t + C
D. 
sin 2t - 
sin 6t + C
Mathematics
Solve the problem.A surveyor is measuring the distance across a small lake. He has set up his transit on one side of the lake 80 feet from a piling that is directly across from a pier on the other side of the lake. From his transit, the angle between the piling and the pier is 30°. What is the distance between the piling and the pier to the nearest foot?
A. 139 feet B. 69 feet C. 46 feet D. 40 feet
Mathematics
Write decimal notation.- 
A. -0.56 B. -560 C. -0.056 D. -5.6
Mathematics